WatchMon-CORE to suit Individual Cell Monitors

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WatchMonCORE - Cell Monitoring Options

Choose the options to go with your WatchMon CORE


  • BlockMon M8: Available in stock

  • LongMon: Available in stock

  • LeafMon: Available, on request.

  • BlockMon M14: Availability. 

WatchMonCORE can still communicate with distributed cell monitors:

  • BlockMon-M8 for Prismatic cells to ease mounting
  • LongMon for Typical 18650 repurposed cells
  • LeafMon for Nissan Leaf cells

Introducing the next generation of WatchMon supervisors. This revamps takes the lessons we have learnt from WM4 and builds on this proven platform with a few new features.

WatchMonCORE will be the core building block and additional components will link to this supervisor in the future.


  • BMS to suit LiFePO4, Lithium-Ion or custom chemistry
  • User configurable parameters and control logic
  • Configurable 30vdc 5A relay  (i.e. remote circuit breaker trip, contactor or fan)
  • Additional inputs/outputs via Expansion Board purchased separately
  • Compatible with all Expansion Board (series 1, 2, or 3)
  • Clock with a backup battery
  • Data logging of key metrics for 10 years
  • firmware upgrades via USB
  • 4-stage display of State of Charge (SoC%) 
  • External ambient temperature sensor
  • Easy-to-use pluggable screw-terminal connectors
  • With distributed cell monitors capable of 28 Ah/day balancing adjustment for each cell 
  • Link to Shuntmon with 500A or 1000A power rating
  • Compatible with MultiMon MM8


Remote Communication

  • WiFi connectivity (normal, disabled, or read-only)
  • CAN bus Opto-Insulated to remote charger/inverter equipment
  • future feature to connect to the cloud portal via MQTT (secure link).


    Power Input

    • Built-in 8v to 30v DC-DC supply
    • With WiFi enabled consumes ~1.7W (Typical 48v battery budget 1Ah/day)
      • When powering the WatchMonCORE (version 4.5) with a supply above 30Vdc (i.e. 48V battery pack voltage), always connect to an isolated DC-DC (ideally 24Vdc) to ensure a robust, long-term, and reliable product.

      Inside the box:

      • 1 x WatchMonCore
      • 1 x USB A-B 1.5m extension cable
      • 1 x Temperature sensor
      • 1 x Screwdriver
      • 1 x Sticker

      Support content options

      • 24 / 7 access to support content and video
      • Email Support (Fair use)
      • Teamviewer remote interactive sessions
      • Extra Support - *Email fair use is included free but if you need more help and advanced technical assistance, you can buy upfront or later on an as-needed basis via Zoom or similar.


      • Easier to use layout than previous models
      • Cell Monitor port (aka CMU) now with its own external fully isolated communication module named "IsoMon3" that can link to LongMon, BlockMon and LeafMon
      • CMU and Shunt serial ports have a different number of pins to avoid confusion
      • New onboard Relay (30vdc 5a relay) making it easier for DIY wiring

      Optional Expansion Board (series 3) details

      • 3 x Mechanical 30Vdc 5A relay outputs
      • 3 x Solid state relay SSR 65vdc 5Amax isolated modules outputs (1A cont.)
      • 2 x Isolated inputs 5-65vdc sensor channel
      • 2 x ADC 0-5vdc (future development option)
      • 1 x RS485 Serial port (future development option)
      • 1 x Remote Addressable LED (future development option)
      • Compatible with all supervisors

      Optional extras can be purchased: 

      • Expansion Board
      • 500A or 1000A Shunt Monitor
      • Cell monitors to suit your battery
      • Extra Support - * Email fair use is included free but if you need more help and advanced technical assistance, you can buy upfront or later on an as-needed basis via Zoom or similar.

      Helicopter preview of the Product with Optional Expansion Board 3

      Overview and Unboxing

      Step-by-Step Supervisor Installation with LongMons


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